rails                  
                                          
                                          
  
                                          
  
                                          
                                          
 trains  are  so  constructed  that  they 
 have  to follow a set path. this path is 
 called a "railway",  which  is comprised 
 of  two metal rails, hence its nickname. 
                                          
 because the  low  friction  between  the 
 wheels of the train  and the rail metal, 
 there are  limits for  how acute a curve 
 can be,  and even more  so for  how much 
 the  ground  under   the  rails  can  be 
 sloped. thus a railway  is often not led 
 on top of hills,  rather through them in 
 tunnels  (if   they   are   large),   or 
            artificial chasms.            
                                          
 there will be trees on  the side  of the 
 rails, but not too  close, or they  will 
 be cut  down  by the  railway  janitors. 
 there will  be  plains,  and  bodies  of 
                  water.                  
                                          
 trains go by  day  and by  night.  along 
      the way, there is information       
 scattered, often  put  on top of  poles, 
 to be interpreted by the  train drivers. 
 different  parts  of  the  railway  have 
         different speed limits.          
                                          
 sometimes, trains have to stop  and wait 
 for something to happen, far  away. this 
 is  signaled  by  red  or  green lights. 
                                          
                                  
                                          
 many  people  follow  the rails by foot. 
 often  this  proves  to be  the  shorter 
 path  between two  points. however  this 
 is   frowned  upon,  and  very  impolite 
        toward the train drivers!